Make video quality analysis unittests print to log instead of stdout.

I think it's best to avoid printing these perf numbers since
when we turn on perf measurements for Android, it will be for
all tests as far as I understand it works today.

TEST=trybots passing tools_unittests
BUG=none
R=phoglund@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3109005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5072 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed